flipnotize

1990 ls400 issues dash indicator lights come on when rpm falls to idle , battery/brake/rear lights/oil and more, replaced the battery yesterday and shop did a load test and faild, before I buy a new alternator can this be a alternator fuse issue? Btw all terminal ams wires are clean & sanded down. Picture attached. Cold start 12v idle is 11.85v thanks for the help.

Yamae

Was the second photo 12.07V taken after the photo 11.85V?
If so, it's not the fuse. The alternator itself is almost dead.

flipnotize

Thanks yamae, 12.07v is engine off, 11.85v engine idle 500rpm

flipnotize

is there a voltage regulator I can find on this car? 11.85v on idle, but when I rev up to 1500rpm the volts go up to 13v

cgawelko

the car has an IVR (internal voltage regulator) its the harness that plugs into the alternator. They havnt had EVR in many years man. we can all hope its external.

Yamae

Both voltages are way too low. It should be around 13V on idle and at least 14.0V or a bit higher at 1500rpm.

flipnotize

Thanks alot for everyones help, I had the alternator replaced and everything is working fine now. Again thanks for the help.

sha4000

iTrader: (1)

Good for you.